Punching machine



NOV. 26, 1929. w c 1,736,958

PUNGHING MACHINE Filed June 25, 1924 V 2 Sheets-Sheet 1 INVENTOR.

FQHNK WHITECIQIZ,

' Hi5 ATTOQNEY.

Nov. 26, 1929 F. WHITECAR PUNUHING MACHINE Filed June 25, 1924 2 Sheets-Sheet 2 INVENTOP FRANK I/W-HTECFIQ,

BY fizga Ennunn v V ma M H/S ATTOQNE Patented Nov. 26, 1929 FRANK WHITECAR, OF IRVINGTON, NEW

JERSEY, ASSIGNOR TO GENERAL MOTORS CORPORATION, OF DETROIT, IKICHIGAN, A CORPORATION OF DELAWARE PUNCHING MACHINE Application filed June 23,

This invention relates to punching machines and is herein shown as embodied in a machine for feeding flat discs successively to punches, punching the discs to form teated and apertured end rings for roller bearing cages, stripping the rings from the punches, and ejecting them.

An object of the invention is to provide a machine for synchronizing the feeding, punching and ejecting mechanisms to secure positive and rapid feed with an etficient discharge of the work-pieces. To these ends and also to improve generally upon devices of the character indicated, my invention consists in the various matters hereinafter described and claimed.

Referringto the drawings, Figure 1 is a side elevation of the machine, with parts broken away.

Figure 2 is a front elevation with some parts removed.

Figure 3 is a plan View of a die.

Figure 4 is a plan view of the ejector pan or carrier and associated mechanism and Figure 5 is a sectional View of the punch and die and stripper mechanism.

The numeral 10 designates upright frame members having guides for a vertically reciprocating plunger 12, operated from a crank shaft 14. The shaft has a disc 16 at one end carrying a pin 18 swiveled to a long link 20 adjustably connected to a fork 22 which is pivoted at 24 to the upper end of an arm 26 fixed to a rock shaft 28 journalled in bearings 30 on a bracket 32 adjustably supported by the frame. An arm 34 is fixed to the rock shaft between the bearings 30 and is pivotally connected by links 36 to a depending lug on a slide holder 38 slidable in ways on the bracket 32 and carrying a feed slide 40 which successively pushes discs rearwardly from the bottom of a pile held in a vertical magazine 42. The magazine is composed of four vertical angle irons fastened to the angle plates 44, the horizontal flanges 46 of which are bolted on the bracket 32. The discs are fed by the slide 40 along a horizontal surface formed by the top face of a bracket 48 bolted to the bracket 32 and having side guides 50 connected by cross bars 52. The stroke of the 1924. Serial No. 721,723.

feed slide is suflicient to carry the discs in the magazine across the bracket 48 onto a work support 54. Link 20 is preferably telescopic with a safety spring 49 therein to yieldin case the work pieces jam and bracket 32 rests on a slide 51 vertically adjustable relatively to the work support by a screw 53.

The work support 54 is herein shown as a die plate having a central opening 56 for the waste pill which is cut out from the center of the disc and it has a circular series of openings 58 and 60 to accommodate the circular series of punches and extruding tools which form the tie-bar openings and roller holding teats on the end rings of roller bearing cages. The work support has a U-shape guard 62 forming a work locating means to position the discs as they come from the feed slide. The die plate is fastened to a block 64 supported on a square base plate 66 having lugs by which it is bolted to lugs on a heavy casting between the side frame members 10. The block 64 has two upwardly extending guide pins 68 entering openings in guide bosses 70 on a holder 72 which reciprocates with the plunger 12. The holder has fastened to it on the underside a punch carrier 74 having a central punch 7 6 and a spring pressed stripper pin 7 8 which pushes the waste pill down through the die opening 56 after it has been sheared from the center of the work disc. A stripper ring surrounds the punch 7 6 and has a sliding movement with respect thereto, it being, limited 1n its downward movement by a C11- cular flange engaging an annular recess in a retaining ring 82 bolted to the punch carrier 74. The stripper ring 80 has a series of openings to allow the passage of the hollow punches and teating tools 84 which are also fastened on the punch carrier 74. The ring 80 abuts against one or more sliding pins 86 movable endwise in openings in the carrier 7 4 and holder 72 and abutting at their upper ends against a disc 88 s'lidable in a recess of the holder 72 and having a central stem 90 projecting upwardly through a hollow boss 92 on the holder, said boss adapted to be clamped in the base 94 of the plunger 12. The end of the stem 90 abuts against the middle portion of an arm 96 extending transversely through a horizontal slot 9'? in the plunger 12 and pivoted at its front end in brackets 08 tastened to the front of the plunger. The arm 96 is movable vertically with the plunger, its rear end being designed to engage a stop bolt 100 a-justably held in a cross bar 102 which is bolted across the frame bars 10.

Tt is apparent that, as the plunger and punches descend, the ring will first engage the work disc as it rests on its support, and that the continued descent oil the punches will pertorate the work and cause the ring 80 to move upwardly into its recess in the punch carrier. This movement will raise the pins 86, the disc 88, pin and the rearward end or the arm 96 relatively to the plunger. As the center pill is punched out by the central punch 7 6 and started down through the opening 56 by the stripper pin 78, the work piece, now in the form of a ring, is held by the punch '1' 6, by frictional contact between its inner surface and the outer surface of the punch. When the plunger rises the work piece or ring is therefore lifted by the punch 7 6 and travels upwardly with the punch carrier and plunger until the rearward end of arm 96 contacts with the adjustable stop bolt 100. This causes a depression of the stem 90 and the stripper ring 80 thereby knocking oft the work piece into a swinging carrier or ejector 104 which will now be described.

The carrier 104: catches the work pieces from the punch and discharges them at the rear of the machine and comprises a pan 104C open at the rear and having a rim 106 around the remaining part of its periphery. The pan'is inclined downwardly to the rear to facilitate discharge of the work pieces. The pan is riveted to the upper side of a swing ing arm 108 pivoted at its end to a vertical pivot pin 110 secured to the horizontal flange of an angle bracket 112 fastened to the vertical flange of a long angle'iron 114 which eX- tends 'from front to rear of the machine at one side of the base plate 66. The arm 108 is pressed downwardly against the angle iron 112 and is also pressed rearwardly by a combined torsion and expansion spring 116 fixed to the arm and fixedv to the upper end of the pivot pin 110. Near the pivot pin, the arm 108 has a rounded projection 120 which is constantly pressed by a coil spring 118 against the end of a sliding member 122 pivoted to a collar 12 1 clamped on a square rod 126 which slides from front to rear of the machine. The member 122 can be adjusted about its pivot to bring its end in horizontal alignment with the projection 120 by means of the adjusting bolt 127. The square rod 126 is guided in square openings in brackets 128 and 130 bolted to the vertical flange of the long angle iron 114. A collar 132 is clamped to the square rod and pivotally connected by links 13 i with the depending arm 136 of a bell crank lever pivoted at 188 in 'pivotally connected by a link 142 to a bolt 14d adj ustably fastened to a bar 1 l6 on the plunger 12. The reciprocation oi; the plunger will obviousl reciprocate the square rod and swing the arm 108 and the carrier 1042 in one direction against the tension 01: the spring 118.

The rearward movement of the square rod 126 and the member 122 permits the arm 106 and the carrier 10 to move to the rear under the influence of the springs 116 and 118, these latter holding the projection. 120 continuously against the member 122. The feed, punching and ejecting mechanism is so timed that, immediately after a work piece is ted over the die, it is pierced," raised by the punches,

and stripped therefrom just before the plunger reaches its upper limit of movement. At this time, the plunger swings the carrier or pan 10-1- forwardly against the tension ot the springs to a position under the punches. The carrier or pan catches the work piece and, as the plunger again descends, the pan throws the work piece rearwardly out of the machine. The projection 120 is so near the pivot pin 110 that a very slight movement of the member 122 and its operating mechanism is sullicient to swing the pan clear of the plunger and back again into work receiving position.

Although theinvention has been illustrated and described by reference to a specific machine, it should be understood that, in its broader aspects, it is not necessarily limited to the precise machine shown nor to any par ticular form of punching machine.

ll claim:

1. In a machine of the character described, a work support held in a fixed position, a reciprocating punch, a magazine, mechanism for feeding individual work pie es successively from the magazine into the path of the punch and upon the support, and means operated in timed relation to the feeding mechanism for successively stripping the work pieces from the punch and ejecting them from the machine.

2. In a machine of the characten described, a plunger having a punch to perforate work pieces, a support for the work pieces, means for reciprocating the plunger, a pivoted arm, a pan carried by the arm to intermittently cross the patlpof the punch to receive the work pieces, a sliding member engaging the arm near its pivot to move the pan under the punch, and a spring to move the pan in the other direction to err-- pel the work pieces from the machine.

3. In a machine of the character described, a plunger having a punch to perforate work pieces, a support for the workpieces, means for reciprocating the plunger, a pivoted arm having a pan to receive work pieces from the punch, a sliding mem'her engaging the arm,

a spring for holding the arm against the sliding memloer, and means controlled by .the plunger for actuating the sliding memher.

4:. In a machine of the character described, a plunger having a punch toperforate "WOI'k pieces, a support for the Work pieces, means for reciprocating the plunger, a stripper for removing the Work pieces from. the punch, a carrier movable into the path of the punch for receiving the Work pieces, a spring constantly urging said carrier out of the path of the punch, a rod actuated by the plunger, and means on the rod for engaging the carrier and moving it in opposition to the spring.

5. In a machine of the class described, a punch, a die, a magazine, a feed slide, a bracket supporting the magazine and feed slide, and means for raising and loWerin the gracket to correspond to the height the In testimonywhereof l hereunto afix my signature.

FRANK WHITE GAR. 

